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Abdesselem M, Pétri N, Kuhner R, Mousseau F, Rouffiac V, Gacoin T, Laplace-Builhé C, Alexandrou A, Bouzigues CI. Real-time in vivo ROS monitoring with luminescent nanoparticles reveals skin inflammation dynamics. Biomed Opt Express 2023; 14:5392-5404. [PMID: 37854553 PMCID: PMC10581786 DOI: 10.1364/boe.501914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 08/30/2023] [Accepted: 08/31/2023] [Indexed: 10/20/2023]
Abstract
Reactive oxygen species (ROS) are key regulators in numerous pathological contexts, including cancer or inflammation. Their role is complex, which justifies the need for methods enabling their quantitative and time-resolved monitoring in vivo, in the perspective to profile tissues of individual patients. However, current ROS detection methods do not provide these features. Here, we propose a new method based on the imaging of lanthanide-ion nanoparticles (GdVO4:Eu), whose photoluminescence is modulated by the surrounding ROS concentration. We monitored their luminescence after intradermic injection in a mouse ear submitted to an inflammation-inducing topical stimulus. Based on this approach, we quantified the ROS concentration after inflammation induction and identified a two-step kinetics of ROS production, which may be attributed to the response of resident immune cells and their further recruitment at the inflammation locus.
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Affiliation(s)
- M Abdesselem
- Laboratory for Optics and Biosciences, Ecole polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, 91128 Palaiseau cedex, France
| | - N Pétri
- Laboratory for Optics and Biosciences, Ecole polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, 91128 Palaiseau cedex, France
| | - R Kuhner
- Laboratory for Optics and Biosciences, Ecole polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, 91128 Palaiseau cedex, France
| | - F Mousseau
- Laboratory for Optics and Biosciences, Ecole polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, 91128 Palaiseau cedex, France
| | - V Rouffiac
- Photon Imaging and Flow Cytometry, CNRS, INSERM, Gustave Roussy Cancer Campus, 114, rue Edouard Vaillant, 94805 Villejuif Cedex, France
| | - T Gacoin
- Laboratoire de Physique de la Matière Condensée, Ecole polytechnique, Institut Polytechnique de Paris, CNRS, 91128 Palaiseau cedex, France
| | - C Laplace-Builhé
- Photon Imaging and Flow Cytometry, CNRS, INSERM, Gustave Roussy Cancer Campus, 114, rue Edouard Vaillant, 94805 Villejuif Cedex, France
| | - A Alexandrou
- Laboratory for Optics and Biosciences, Ecole polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, 91128 Palaiseau cedex, France
| | - C I Bouzigues
- Laboratory for Optics and Biosciences, Ecole polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, 91128 Palaiseau cedex, France
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2
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Mousseau F, Féraudet Tarisse C, Simon S, Gacoin T, Alexandrou A, Bouzigues CI. Multititration: The New Method for Implementing Ultrasensitive and Quantitative Multiplexed In-Field Immunoassays Despite Cross-Reactivity? Anal Chem 2023; 95:13509-13518. [PMID: 37639578 DOI: 10.1021/acs.analchem.3c01846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
The accurate in-field titration of multiple pathogens is essential to efficiently describe and monitor environmental or biological contamination, isolate, act, and treat adequately. This underscores the requirement of portable, fast, quantitative, and multiplexed detection technologies, which, however, have not been properly developed so far, notably because it has been hindered by the phenomenon of cross-reactivity. In this work, we proposed a new analytical method based on the imaging through a portable device of lanthanide-based nanoparticles (YVO4:Eu) for spatially multiplexed detection, relying on a multiparameter analysis, i.e., a simultaneous analysis of all of the luminescence signals through the comparison to a calibration surface built in the presence of multiple analytes of interest. We then demonstrated the possibility to simultaneously quantify by multiplexed lateral flow assay (xLFA) the three enterotoxins SEG, SEH, and SEI in unknown mixtures, over two concentration decades (from a dozen of pg·mL-1 to few ng·mL-1). Assays were performed in less than an hour (25 min of strip migration followed by 30 min of drying at room temperature), the time during which the presence of the operator was not required for more than 5 min, in order to dip the strip and have it imaged by the reader. The concepts of nominal concentration recovery, coefficient of variation (CV), limit of blank (LOB), and limit of detection (LOD) were discussed in detail in the context of multiplexed assays. With our new definitions, quantitative results demonstrated a high recovery of the nominal concentrations (115%), reliability (CV = 20%), and sensitivity (LOBs of 3, 27, and 6 pg·mL-1 for SEG, SEH, and SEI respectively, and LODs of 6, 48, and 11 pg·mL-1 for SEG, SEH, and SEI, respectively). Based on this method, we observed an increase in sensitivity of 100 compared to the other multiplexed LFA labeled with gold particles and we approached the sensitivity of the simplex enzyme-linked immunosorbent assay (ELISA) performed with the same capture and detection antibodies. To conclude, our results, which are applicable to virtually any kind of multiplexed test, pave the way to the next generation of in-field analytical immunoassays by providing fast, quantitative, and highly sensitive multiplexed detection of biomarkers or pathogens.
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Affiliation(s)
- Fanny Mousseau
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, Route de Saclay, 91128 Palaiseau, France
| | - Cécile Féraudet Tarisse
- Département Médicaments et Technologies pour la Santé (DMTS), Université Paris-Saclay, CEA, INRAE, 91191 Gif-sur-Yvette, France
| | - Stéphanie Simon
- Département Médicaments et Technologies pour la Santé (DMTS), Université Paris-Saclay, CEA, INRAE, 91191 Gif-sur-Yvette, France
| | - Thierry Gacoin
- Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique, Institut Polytechnique de Paris, CNRS, Route de Saclay, 91128 Palaiseau, France
| | - Antigoni Alexandrou
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, Route de Saclay, 91128 Palaiseau, France
| | - Cédric Ismael Bouzigues
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, Route de Saclay, 91128 Palaiseau, France
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3
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Mousseau F, Féraudet Tarisse C, Simon S, Gacoin T, Alexandrou A, Bouzigues CI. Luminescent lanthanide nanoparticle-based imaging enables ultra-sensitive, quantitative and multiplexed in vitro lateral flow immunoassays. Nanoscale 2021; 13:14814-14824. [PMID: 34533151 DOI: 10.1039/d1nr03358a] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Lateral Flow Assays (LFAs) have been extensively used on-site to rapidly detect analytes, possibly in complex media. However, standard gold nanoparticle-based LFAs lack sensitivity and cannot provide quantitative measurements with high accuracy. To overcome these limitations, we image lanthanide-doped nanoparticles (YVO4:Eu 40%) as new luminescent LFA probes, using a homemade reader coupled to a smartphone and propose an original image analysis allowing strip quantification regardless of the shape of the test band signal. This method is demonstrated for the detection of staphylococcal enterotoxins SEA, SEG, SEH, and SEI. A systematic comparison to state-of-the-art gold nanoparticle-based LFA revealed an analytical sensitivity enhancement of at least one order of magnitude. We furthermore provided measurements of absolute toxin concentration over two orders of magnitude and demonstrated simultaneous quantitative detection of multiple toxins with unaltered sensitivity. In particular, we reached concentrations 100 times lower than the ones reported in the literature for on-site multiplexed LFA targeting enterotoxins. Altogether, these results highlight that our luminescent nanoparticle-based method provides a powerful and versatile on-site framework to detect multiple biomolecules with sensitivity approaching that obtained by ELISA. This paves the way to a change of paradigm in the field of analytical immunoassays by providing fast in situ quantitative high sensitivity detection of biomarkers or pathogens.
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Affiliation(s)
- F Mousseau
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, Route de Saclay, 91128 Palaiseau, France.
| | - C Féraudet Tarisse
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), 91191 Gif-sur-Yvette, France
| | - S Simon
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), 91191 Gif-sur-Yvette, France
| | - T Gacoin
- Laboratoire de Physique de la Matière Condensée, Ecole Polytechnique, Institut Polytechnique de Paris, CNRS, Route de Saclay, 91128 Palaiseau, France
| | - A Alexandrou
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, Route de Saclay, 91128 Palaiseau, France.
| | - C I Bouzigues
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Institut Polytechnique de Paris, CNRS, INSERM, Route de Saclay, 91128 Palaiseau, France.
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4
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Kokkinos A, Liaskos C, Alexiadou K, Papassotiriou I, Margeli A, Argyrakopoulou G, Perrea D, Alexandrou A, Katsilambros N, Diamantis T, Tentolouris N. Plasma levels of soluble urokinase plasminogen activator receptor (suPAR) and high-sensitivity C-reactive protein after Roux-en-Y gastric bypass or sleeve gastrectomy: a 1-year prospective observational study. J Endocrinol Invest 2021; 44:599-608. [PMID: 32681464 DOI: 10.1007/s40618-020-01358-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 07/08/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE Low-grade inflammation in obesity contributes to the development of cardiovascular disease, diabetes mellitus and cancer, and is associated with increased mortality. The purpose of this 1-year prospective observational study was to examine the weight loss effect of bariatric surgery on plasma concentrations of two inflammatory markers, namely high-sensitivity C-reactive protein (hsCRP) and soluble urokinase-type plasminogen activator receptor (suPAR), in patients with obesity. METHODS Sixteen subjects without obesity and 32 patients with obesity class III, who had already settled upon Roux-en-Y gastric bypass (RYGB) or sleeve gastrectomy (SG) were included in the study. Subjects without obesity were examined once, at baseline; patients with obesity were examined preoperatively (baseline) and 3, 6 and 12 months postoperatively. RESULTS Plasma suPAR and hsCRP concentrations at baseline were higher in patients with obesity than in lean participants (2.68 ± 0.86 vs 1.86 ± 0.34 ng/mL, p < 0.001 and 9.83 ± 9.55 vs 1.36 ± 1.95 mg/dL, p < 0.001). Levels of suPAR following bariatric surgery increased significantly 3 months after either RYGB or SG (3.58 ± 1.58 vs 3.26 ± 0.7 ng/mL, respectively) and declined at 6 (3.19 ± 1.75 vs 2.8 ± 0.84 ng/mL, respectively) and 12 months (2.6 ± 1.5 vs 2.22 ± 0.49 ng/mL, respectively; p < 0.05 for the effect of time on suPAR levels during the study), whereas those of hsCRP declined consistently after bariatric surgery (3 months: 5.44 ± 3.99 vs 9.47 ± 11.98 mg/dL, respectively; 6 months; 5.39 ± 5.6 vs 10.25 ± 17.22 mg/dL, respectively; and 12 months: 2.23 ± 2.5 vs 3.07 ± 3.63 mg/dL, respectively; p < 0.001 for the effect of time on hsCRP levels during the study). 1-year change in BMI was negatively associated with suPAR levels at 12 months. CONCLUSION Our findings support an association between obesity and low-grade inflammation. Weight loss following bariatric surgery is associated with a consistent decline in plasma hsCRP, while plasma suPAR levels increase at 3 months and decline by 12 months.
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Affiliation(s)
- A Kokkinos
- First Department of Propaedeutic Internal Medicine, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, 17 Agiou Thoma Street, 11527, Athens, Greece
| | - C Liaskos
- First Department of Propaedeutic Internal Medicine, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, 17 Agiou Thoma Street, 11527, Athens, Greece
| | - K Alexiadou
- First Department of Propaedeutic Internal Medicine, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, 17 Agiou Thoma Street, 11527, Athens, Greece
| | - I Papassotiriou
- Department of Clinical Biochemistry, "Aghia Sophia" Children's Hospital, Thivon and Papadiamantopoulou Street, 11527, Athens, Greece
| | - A Margeli
- Department of Clinical Biochemistry, "Aghia Sophia" Children's Hospital, Thivon and Papadiamantopoulou Street, 11527, Athens, Greece
| | - G Argyrakopoulou
- First Department of Propaedeutic Internal Medicine, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, 17 Agiou Thoma Street, 11527, Athens, Greece
| | - D Perrea
- Laboratory of Experimental Surgery and Surgical Research "NS Christeas", Medical School, National and Kapodistrian University of Athens, 15Β Agiou Thoma Street, 11527, Athens, Greece
| | - A Alexandrou
- First Department of Surgery, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, 17 Agiou Thoma Street, 11527, Athens, Greece
| | - N Katsilambros
- First Department of Propaedeutic Internal Medicine, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, 17 Agiou Thoma Street, 11527, Athens, Greece
| | - T Diamantis
- First Department of Surgery, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, 17 Agiou Thoma Street, 11527, Athens, Greece
| | - N Tentolouris
- First Department of Propaedeutic Internal Medicine, Medical School, Laiko General Hospital, National and Kapodistrian University of Athens, 17 Agiou Thoma Street, 11527, Athens, Greece.
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5
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Delialis D, Lamprinoudaki I, Stergiotis S, Patras R, Chatzivasileiou P, Augoulea A, Anagnostis P, Armeni E, Rizos D, Kaparos G, Alexandrou A, Georgiopoulos G, Kontogiannis C, Fotellis D, Stamatelopoulos K. Anti-Mullerian hormone concentrations are inversely associated with subclinical atherosclerosis in premenopausal women. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Anti-Müllerian hormone (AMH) constitutes a marker of ovarian reserve and appears to have a predictive role regarding the time of menopause. Moreover, AMH is associated with adverse cardiac events. History of premature menopause and early onset of menopause have been associated with increased risk of cardiovascular (CV) disease. In addition, menopausal transition and duration of menopause have been associated with increased burden of subclinical atherosclerosis. However, the association between AMH as a marker of female reproductive age with atherosclerosis in premenopausal women is currently unknown.
Purpose
To investigate whether AMH concentrations are associated with markers of early atherosclerosis in healthy, normally menstruating women.
Methods
In a cross-sectional study, vascular structure and function were assessed by measurement of carotid and femoral intima-media thickness (IMT), lipid profile and serum AMH concentrations were assessed. Exclusion criteria were clinically overt CV disease, abnormal ovulatory cycles, polycystic ovarian syndrome, acute infection or chronic inflammatory disease, risk factors for CV disease and any medication
Results
Seventy premenopausal women, aged 32.7±6.5 years, were included. Mean AMH levels were lower in smokers than in non-smokers and negatively associated with total cholesterol (TC) levels. An inverse association between mean AMH concentrations and IMT in all segments was observed. No correlation with other markers of subclinical atherosclerosis or traditional CV risk factors was found. After multi-variable adjustment for traditional CV risk factors, the association between AMH concentrations combined IMT and carotid bulb IMT, remained significant.
Conclusions
In healthy, normally ovulating women, low AMH concentrations are associated with an adverse lipid profile and subclinical atherosclerosis, independently of traditional CV risk factors. This finding suggest a role of decreased follicular reserve with atherosclerotic disease.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- D Delialis
- University of Athens Medical School, Department of Clinical Therapeutics, Athens, Greece
| | - I Lamprinoudaki
- Aretaieio Hospital, Department of Obstetrics and Gynecology, Athens, Greece
| | - S Stergiotis
- Aretaieio Hospital, Department of Obstetrics and Gynecology, Athens, Greece
| | - R Patras
- University of Athens Medical School, Department of Clinical Therapeutics, Athens, Greece
| | - P Chatzivasileiou
- Aretaieio Hospital, Department of Obstetrics and Gynecology, Athens, Greece
| | - A Augoulea
- Aretaieio Hospital, Department of Obstetrics and Gynecology, Athens, Greece
| | - P Anagnostis
- Aristotle University of Thessaloniki, Unit of Reproductive Endocrinology, First Department of Obstetrics and Gynaecology, Medical School, Thessaloniki, Greece
| | - E Armeni
- Aretaieio Hospital, Department of Obstetrics and Gynecology, Athens, Greece
| | - D Rizos
- Aretaieio Hospital, Hormonal and Biochemical Laboratory, Athens, Greece
| | - G Kaparos
- Aretaieio Hospital, Hormonal and Biochemical Laboratory, Athens, Greece
| | - A Alexandrou
- Aretaieio Hospital, Department of Obstetrics and Gynecology, Athens, Greece
| | - G Georgiopoulos
- University of Athens Medical School, Department of Clinical Therapeutics, Athens, Greece
| | - C Kontogiannis
- University of Athens Medical School, Department of Clinical Therapeutics, Athens, Greece
| | - D Fotellis
- University of Athens Medical School, Department of Clinical Therapeutics, Athens, Greece
| | - K Stamatelopoulos
- University of Athens Medical School, Department of Clinical Therapeutics, Athens, Greece
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6
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O'Shaughnessy J, Sousa S, Cruz J, Fallowfield L, Auvinen P, Pulido C, Cvetanovic A, Wilks S, Ribeiro L, Burotto M, Klingbiel D, Messeri D, Alexandrou A, Trask P, Fredriksson J, Machackova Z, Stamatovic L. 165MO Patient (pt) preference for the pertuzumab-trastuzumab fixed-dose combination for subcutaneous use (PH FDC SC) in HER2-positive early breast cancer (EBC): Primary analysis of the open-label, randomised crossover PHranceSCa study. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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7
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O'Shaughnessy J, Sousa S, Cruz J, Fallowfield L, Auvinen P, Pulido C, Cvetanovic A, Wilks S, Ribeiro L, Burotto M, Klingbiel D, Messeri D, Alexandrou A, Trask P, Fredriksson J, Stamatovic L. 80O Patient (pt) preference and satisfaction with the subcutaneous fixed-dose combination of pertuzumab (P) and trastuzumab (H) in pts with HER2-positive early breast cancer (HER2+ eBC): Interim analysis of the open-label, randomised cross-over PHranceSCa study. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.03.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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8
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Lazareth H, Henique C, Lenoir O, Puelles VG, Flamant M, Bollée G, Fligny C, Camus M, Guyonnet L, Millien C, Gaillard F, Chipont A, Robin B, Fabrega S, Dhaun N, Camerer E, Kretz O, Grahammer F, Braun F, Huber TB, Nochy D, Mandet C, Bruneval P, Mesnard L, Thervet E, Karras A, Le Naour F, Rubinstein E, Boucheix C, Alexandrou A, Moeller MJ, Bouzigues C, Tharaux PL. The tetraspanin CD9 controls migration and proliferation of parietal epithelial cells and glomerular disease progression. Nat Commun 2019; 10:3303. [PMID: 31341160 PMCID: PMC6656772 DOI: 10.1038/s41467-019-11013-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 06/07/2019] [Indexed: 01/02/2023] Open
Abstract
The mechanisms driving the development of extracapillary lesions in focal segmental glomerulosclerosis (FSGS) and crescentic glomerulonephritis (CGN) remain poorly understood. A key question is how parietal epithelial cells (PECs) invade glomerular capillaries, thereby promoting injury and kidney failure. Here we show that expression of the tetraspanin CD9 increases markedly in PECs in mouse models of CGN and FSGS, and in kidneys from individuals diagnosed with these diseases. Cd9 gene targeting in PECs prevents glomerular damage in CGN and FSGS mouse models. Mechanistically, CD9 deficiency prevents the oriented migration of PECs into the glomerular tuft and their acquisition of CD44 and β1 integrin expression. These findings highlight a critical role for de novo expression of CD9 as a common pathogenic switch driving the PEC phenotype in CGN and FSGS, while offering a potential therapeutic avenue to treat these conditions. In both focal segmental glomerulosclerosis (FSGS) and crescentic glomerulonephritis (CGN), kidney injury is characterised by the invasion of glomerular tufts by parietal epithelial cells (PECs). Here Lazareth et al. identify the tetraspanin CD9 as a key regulator of PEC migration, and find its upregulation in FSGS and CGN contributes to kidney injury in both diseases.
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Affiliation(s)
- Hélène Lazareth
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France.,Renal Division, Georges Pompidou European Hospital, Assistance Publique-Hôpitaux de Paris, Université de Paris, Paris, F-75015, France.,Laboratoire d'Optique et Biosciences, Ecole polytechnique, CNRS UMR7645, INSERM U1182, Université Paris-Saclay, Palaiseau, F-91128, France
| | - Carole Henique
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France. .,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France. .,Institut Mondor de Recherche Biomédicale, Inserm U955, Equipe 21, Université Paris Est Créteil, Créteil, F-94010, France.
| | - Olivia Lenoir
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - Victor G Puelles
- Department of Nephrology and Clinical Immunology, University Hospital RWTH Aachen, Pauwelsstrasse 30, D-52074, Aachen, Germany.,Department of Medicine III, Faculty of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, D-20246, Germany.,Department of Nephrology and Center for Inflammatory Diseases, Monash University, Melbourne, VIC 3168, Australia
| | - Martin Flamant
- Xavier Bichat University Hospital, Université de Paris, Paris, F-75018, France
| | - Guillaume Bollée
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - Cécile Fligny
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - Marine Camus
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - Lea Guyonnet
- National Cytometry Platform, Department of Infection and Immunity, Luxembourg Institute of Health, Luxembourg, L-4354, Luxembourg
| | - Corinne Millien
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - François Gaillard
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - Anna Chipont
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - Blaise Robin
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - Sylvie Fabrega
- Université de Paris, Institut Imagine, Plateforme Vecteurs Viraux et Transfert de Gènes, IFR94, Hôpital Necker Enfants-Malades, Paris, F-75015, France
| | - Neeraj Dhaun
- Department of Renal Medicine, Royal Infirmary of Edinburgh, Edinburgh, EH16 4SA, Scotland, UK
| | - Eric Camerer
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France
| | - Oliver Kretz
- Department of Medicine III, Faculty of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, D-20246, Germany.,Renal Division, Faculty of Medicine, Medical Centre, University of Freiburg, Freiburg, D-79106, Germany
| | - Florian Grahammer
- Department of Medicine III, Faculty of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, D-20246, Germany.,Renal Division, Faculty of Medicine, Medical Centre, University of Freiburg, Freiburg, D-79106, Germany
| | - Fabian Braun
- Department of Medicine III, Faculty of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, D-20246, Germany.,Renal Division, Faculty of Medicine, Medical Centre, University of Freiburg, Freiburg, D-79106, Germany
| | - Tobias B Huber
- Department of Medicine III, Faculty of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, D-20246, Germany.,Renal Division, Faculty of Medicine, Medical Centre, University of Freiburg, Freiburg, D-79106, Germany
| | - Dominique Nochy
- Department of Pathology, Georges Pompidou European Hospital, Assistance Publique-Hôpitaux de Paris, Paris, F-75015, France
| | - Chantal Mandet
- Department of Pathology, Georges Pompidou European Hospital, Assistance Publique-Hôpitaux de Paris, Paris, F-75015, France
| | - Patrick Bruneval
- Department of Pathology, Georges Pompidou European Hospital, Assistance Publique-Hôpitaux de Paris, Paris, F-75015, France
| | - Laurent Mesnard
- Critical Care Nephrology and Kidney Transplantation, Hôpital Tenon, Assistance Publique-Hôpitaux de Paris, Unité Mixte de Recherche S1155, Pierre and Marie Curie University, Paris, F-75020, France
| | - Eric Thervet
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France.,Renal Division, Georges Pompidou European Hospital, Assistance Publique-Hôpitaux de Paris, Université de Paris, Paris, F-75015, France
| | - Alexandre Karras
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France.,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France.,Renal Division, Georges Pompidou European Hospital, Assistance Publique-Hôpitaux de Paris, Université de Paris, Paris, F-75015, France
| | | | - Eric Rubinstein
- Inserm U935, Université Paris-Sud, Villejuif, F-94800, France
| | - Claude Boucheix
- Inserm U935, Université Paris-Sud, Villejuif, F-94800, France
| | - Antigoni Alexandrou
- Laboratoire d'Optique et Biosciences, Ecole polytechnique, CNRS UMR7645, INSERM U1182, Université Paris-Saclay, Palaiseau, F-91128, France
| | - Marcus J Moeller
- Department of Nephrology and Clinical Immunology, University Hospital RWTH Aachen, Pauwelsstrasse 30, D-52074, Aachen, Germany
| | - Cédric Bouzigues
- Laboratoire d'Optique et Biosciences, Ecole polytechnique, CNRS UMR7645, INSERM U1182, Université Paris-Saclay, Palaiseau, F-91128, France
| | - Pierre-Louis Tharaux
- Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Center - PARCC, 56 rue Leblanc, F-75015, Paris, France. .,Université de Paris, UMR-S970, 56 rue Leblanc, F-75015, Paris, France. .,Renal Division, Georges Pompidou European Hospital, Assistance Publique-Hôpitaux de Paris, Université de Paris, Paris, F-75015, France.
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Lazareth H, Henique C, Lenoir O, Puelles V, Nochy D, Bruneval P, Alexandrou A, Boucheix C, Karras A, Thervet E, Bouzigues C, Tharaux PL. 201. TETRASPANIN CD9 EXPRESSION IN PARIETAL EPITHELIAL CELLS DRIVES GLOMERULAR INJURY DURING CRESCENTIC RAPIDLY PROGRESSIVE GLOMERULONEPHRITIS. Rheumatology (Oxford) 2019. [DOI: 10.1093/rheumatology/kez061.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Abdesselem M, Ramodiharilafy R, Devys L, Gacoin T, Alexandrou A, Bouzigues CI. Fast quantitative ROS detection based on dual-color single rare-earth nanoparticle imaging reveals signaling pathway kinetics in living cells. Nanoscale 2017; 9:656-665. [PMID: 27942670 DOI: 10.1039/c6nr07413h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Reactive oxygen species (ROS), and notably hydrogen peroxide H2O2, are cellular second messengers that are known to control a variety of signaling processes. They can finely regulate the dynamics of signal transduction, cell response and ultimately tissue function. However, there are very few local, quantitative and time-resolved descriptions of their cellular organization at the scale of molecular reactions, due to the lack of efficient sensors. We thus developed a novel nanoprobe-based ROS detection system using the simultaneous imaging of single lanthanide nanoparticles (YAG:Ce and chemically reduced Gd0.6Eu0.4VO4). We reveal that both particle luminescence signals are controlled by their H2O2 local environment. By simultaneously tracking their luminescence, we devised a new approach providing a quantitative (0.5 μM accuracy in the 1-10 μM range) H2O2 measurement with a 500 ms time resolution, surpassing all existing methods by two orders of magnitude, and revealing previously inaccessible molecular events controlling ROS concentration. We used this nanoprobe in living cells to track fast signaling pathways, by measuring the dynamics of H2O2 intracellular concentrations, induced by endothelin-1 (ET-1) stimulation. We thus revealed the mechanisms controlling ROS production, notably the activity modulation of the ROS-producing enzyme NADPH oxidase by fast (<10 s) EGFR transactivation, and measured quantitatively their kinetic parameters through a minimal analytical model. Altogether, these results illustrate how lanthanide nanoparticle-based sensors are a powerful tool to dynamically probe molecular mechanisms shaping the oxidative cell response.
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Affiliation(s)
- M Abdesselem
- Laboratory for Optics and Biosciences, Ecole Polytechnique, INSERM U1182 - CNRS UMR7645. and Universite Paris-Saclay, 91120 Palaiseau, France.
| | - R Ramodiharilafy
- Laboratory for Optics and Biosciences, Ecole Polytechnique, INSERM U1182 - CNRS UMR7645. and Universite Paris-Saclay, 91120 Palaiseau, France.
| | - L Devys
- Laboratory of Condensed Matter Physics, Ecole Polytechnique, CNRS UMR7643 and Universite Paris-Saclay, 91120 Palaiseau, France
| | - T Gacoin
- Laboratory of Condensed Matter Physics, Ecole Polytechnique, CNRS UMR7643 and Universite Paris-Saclay, 91120 Palaiseau, France
| | - A Alexandrou
- Laboratory for Optics and Biosciences, Ecole Polytechnique, INSERM U1182 - CNRS UMR7645. and Universite Paris-Saclay, 91120 Palaiseau, France.
| | - C I Bouzigues
- Laboratory for Optics and Biosciences, Ecole Polytechnique, INSERM U1182 - CNRS UMR7645. and Universite Paris-Saclay, 91120 Palaiseau, France.
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Triantafyllou N, Armeni E, Christidi F, Rizos D, Kaparos G, Palaiologou A, Augoulea A, Alexandrou A, Zalonis I, Tzivgoulis G, Lambrinoudaki I. The intensity of menopausal symptoms is associated with episodic memory in postmenopausal women. Climacteric 2016; 19:393-9. [DOI: 10.1080/13697137.2016.1193137] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- N. Triantafyllou
- 1st Department of Neurology, National and Kapodistrian University of Athens, Aiginiteio Hospital, Athens, Greece
| | - E. Armeni
- 2nd Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens, Aretaieio Hospital, Athens, Greece
| | - F. Christidi
- 1st Department of Neurology, National and Kapodistrian University of Athens, Aiginiteio Hospital, Athens, Greece
| | - D. Rizos
- Hormonal and Biochemical Laboratory, National and Kapodistrian University of Athens, Aretaieio Hospital, Athens, Greece
| | - G. Kaparos
- Hormonal and Biochemical Laboratory, National and Kapodistrian University of Athens, Aretaieio Hospital, Athens, Greece
| | - A. Palaiologou
- 2nd Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens, Aretaieio Hospital, Athens, Greece
| | - A. Augoulea
- 2nd Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens, Aretaieio Hospital, Athens, Greece
| | - A. Alexandrou
- 2nd Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens, Aretaieio Hospital, Athens, Greece
| | - I. Zalonis
- 1st Department of Neurology, National and Kapodistrian University of Athens, Aiginiteio Hospital, Athens, Greece
| | - G. Tzivgoulis
- 2nd Department of Neurology, National and Kapodistrian University of Athens, Attiko Hospital, Athens, Greece
| | - I. Lambrinoudaki
- 2nd Department of Obstetrics and Gynecology, National and Kapodistrian University of Athens, Aretaieio Hospital, Athens, Greece
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12
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Kostakis ID, Alexandrou A, Armeni E, Damaskos C, Kouraklis G, Diamantis T, Tsigris C. Comparison Between Minimally Invasive and Open Gastrectomy for Gastric Cancer in Europe: A Systematic Review and Meta-analysis. Scand J Surg 2016; 106:3-20. [PMID: 26929289 DOI: 10.1177/1457496916630654] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
AIMS We compared laparoscopic and robotic gastrectomies with open gastrectomies and with each other that were held for gastric cancer in Europe. METHODS We searched for studies conducted in Europe and published up to 20 February 2015 in the PubMed database that compared laparoscopic or robotic with open gastrectomies for gastric cancer and with each other. RESULTS We found 18 original studies (laparoscopic vs open: 13; robotic vs open: 3; laparoscopic vs robotic: 2). Of these, 17 were non-randomized trials and only 1 was a randomized controlled trial. Only four studies had more than 50 patients in each arm. No significant differences were detected between minimally invasive and open approaches regarding the number of retrieved lymph nodes, anastomotic leakage, duodenal stump leakage, anastomotic stenosis, postoperative bleeding, reoperation rates, and intraoperative/postoperative mortality. Nevertheless, laparoscopic procedures provided higher overall morbidity rates when compared with open ones, but robotic approaches did not differ from open ones. On the contrary, blood loss was less and hospital stay was shorter in minimally invasive than in open approaches. However, the results were controversial concerning the duration of operations when comparing minimally invasive with open gastrectomies. Additionally, laparoscopic and robotic procedures provided equivalent results regarding resection margins, duodenal stump leakage, postoperative bleeding, intraoperative/postoperative mortality, and length of hospital stay. On the contrary, robotic operations had less blood loss, but lasted longer than laparoscopic ones. Finally, there were relatively low conversion rates in laparoscopic (0%-6.7%) and robotic gastrectomies (0%-5.6%) in most studies. CONCLUSION Laparoscopic and robotic gastrectomies may be considered alternative approaches to open gastrectomies for treating gastric cancer. Minimally invasive operations are characterized by less blood loss and shorter hospital stay than open ones. In addition, robotic procedures have less blood loss, but last longer than laparoscopic ones.
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Affiliation(s)
- I D Kostakis
- 1 Second Department of Propedeutic Surgery, "Laiko" General Hospital, National and Kapodistrian University of Athens, Medical School, Athens, Greece
| | - A Alexandrou
- 2 First Department of Surgery, "Laiko" General Hospital, National and Kapodistrian University of Athens, Medical School, Athens, Greece
| | - E Armeni
- 3 Second Department of Obstetrics and Gynecology, "Aretaieio" Hospital, National and Kapodistrian University of Athens, Medical School, Athens, Greece
| | - C Damaskos
- 1 Second Department of Propedeutic Surgery, "Laiko" General Hospital, National and Kapodistrian University of Athens, Medical School, Athens, Greece
| | - G Kouraklis
- 1 Second Department of Propedeutic Surgery, "Laiko" General Hospital, National and Kapodistrian University of Athens, Medical School, Athens, Greece
| | - T Diamantis
- 2 First Department of Surgery, "Laiko" General Hospital, National and Kapodistrian University of Athens, Medical School, Athens, Greece
| | - C Tsigris
- 2 First Department of Surgery, "Laiko" General Hospital, National and Kapodistrian University of Athens, Medical School, Athens, Greece
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Abdesselem M, Schoeffel M, Maurin I, Ramodiharilafy R, Autret G, Clément O, Tharaux PL, Boilot JP, Gacoin T, Bouzigues C, Alexandrou A. Correction to multifunctional rare-earth vanadate nanoparticles: luminescent labels, oxidant sensors, and MRI contrast agents. ACS Nano 2015; 9:4660. [PMID: 25844799 DOI: 10.1021/acsnano.5b01924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Lambrinoudaki I, Bouziou G, Armeni E, Spyropoulou A, Koundi K, Rizos D, Augoulea A, Alexandrou A, Creatsa M, Panoulis C, Dendrinos S, Leonadrou AA, Zervas IM. Circulating androgens are associated with mood disturbances in young postmenopausal women. Climacteric 2015; 18:205-13. [DOI: 10.3109/13697137.2014.984674] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abdesselem M, Schoeffel M, Maurin I, Ramodiharilafy R, Autret G, Clément O, Tharaux PL, Boilot JP, Gacoin T, Bouzigues C, Alexandrou A. Multifunctional rare-Earth vanadate nanoparticles: luminescent labels, oxidant sensors, and MRI contrast agents. ACS Nano 2014; 8:11126-11137. [PMID: 25290552 DOI: 10.1021/nn504170x] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Collecting information on multiple pathophysiological parameters is essential for understanding complex pathologies, especially given the large interindividual variability. We report here multifunctional nanoparticles which are luminescent probes, oxidant sensors, and contrast agents in magnetic resonance imaging (MRI). Eu(3+) ions in an yttrium vanadate matrix have been demonstrated to emit strong, nonblinking, and stable luminescence. Time- and space-resolved optical oxidant detection is feasible after reversible photoreduction of Eu(3+) to Eu(2+) and reoxidation by oxidants, such as H2O2, leading to a modulation of the luminescence emission. The incorporation of paramagnetic Gd(3+) confers in addition proton relaxation enhancing properties to the system. We synthesized and characterized nanoparticles of either 5 or 30 nm diameter with compositions of GdVO4 and Gd0.6Eu0.4VO4. These particles retain the luminescence and oxidant detection properties of YVO4:Eu. Moreover, the proton relaxivity of GdVO4 and Gd0.6Eu0.4VO4 nanoparticles of 5 nm diameter is higher than that of the commercial Gd(3+) chelate compound Dotarem at 20 MHz. Nuclear magnetic resonance dispersion spectroscopy showed a relaxivity increase above 10 MHz. Complexometric titration indicated that rare-earth leaching is negligible. The 5 nm nanoparticles injected in mice were observed with MRI to concentrate in the liver and the bladder after 30 min. Thus, these multifunctional rare-earth vanadate nanoparticles pave the way for simultaneous optical and magnetic resonance detection, in particular, for in vivo localization evolution and reactive oxygen species detection in a broad range of physiological and pathophysiological conditions.
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Affiliation(s)
- Mouna Abdesselem
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique , CNRS UMR 7645-INSERM U696, 91128 Palaiseau Cedex, France
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Rezgui R, Lestini R, Kühn J, Fave X, McLeod L, Myllykallio H, Alexandrou A, Bouzigues C. Differential interaction kinetics of a bipolar structure-specific endonuclease with DNA flaps revealed by single-molecule imaging. PLoS One 2014; 9:e113493. [PMID: 25412080 PMCID: PMC4239081 DOI: 10.1371/journal.pone.0113493] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 10/23/2014] [Indexed: 11/18/2022] Open
Abstract
As DNA repair enzymes are essential for preserving genome integrity, understanding their substrate interaction dynamics and the regulation of their catalytic mechanisms is crucial. Using single-molecule imaging, we investigated the association and dissociation kinetics of the bipolar endonuclease NucS from Pyrococcus abyssi (Pab) on 5′ and 3′-flap structures under various experimental conditions. We show that association of the PabNucS with ssDNA flaps is largely controlled by diffusion in the NucS-DNA energy landscape and does not require a free 5′ or 3′ extremity. On the other hand, NucS dissociation is independent of the flap length and thus independent of sliding on the single-stranded portion of the flapped DNA substrates. Our kinetic measurements have revealed previously unnoticed asymmetry in dissociation kinetics from these substrates that is markedly modulated by the replication clamp PCNA. We propose that the replication clamp PCNA enhances the cleavage specificity of NucS proteins by accelerating NucS loading at the ssDNA/dsDNA junctions and by minimizing the nuclease interaction time with its DNA substrate. Our data are also consistent with marked reorganization of ssDNA and nuclease domains occurring during NucS catalysis, and indicate that NucS binds its substrate directly at the ssDNA-dsDNA junction and then threads the ssDNA extremity into the catalytic site. The powerful techniques used here for probing the dynamics of DNA-enzyme binding at the single-molecule have provided new insight regarding substrate specificity of NucS nucleases.
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Affiliation(s)
- Rachid Rezgui
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS (Centre National pour la Recherche Scientifique) UMR (Unité Mixte de Recherche) 7645, Inserm (Institut national de la santé et de la recherche médicale) U696, Palaiseau, France
| | - Roxane Lestini
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS (Centre National pour la Recherche Scientifique) UMR (Unité Mixte de Recherche) 7645, Inserm (Institut national de la santé et de la recherche médicale) U696, Palaiseau, France
| | - Joëlle Kühn
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS (Centre National pour la Recherche Scientifique) UMR (Unité Mixte de Recherche) 7645, Inserm (Institut national de la santé et de la recherche médicale) U696, Palaiseau, France
| | - Xenia Fave
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS (Centre National pour la Recherche Scientifique) UMR (Unité Mixte de Recherche) 7645, Inserm (Institut national de la santé et de la recherche médicale) U696, Palaiseau, France
| | - Lauren McLeod
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS (Centre National pour la Recherche Scientifique) UMR (Unité Mixte de Recherche) 7645, Inserm (Institut national de la santé et de la recherche médicale) U696, Palaiseau, France
| | - Hannu Myllykallio
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS (Centre National pour la Recherche Scientifique) UMR (Unité Mixte de Recherche) 7645, Inserm (Institut national de la santé et de la recherche médicale) U696, Palaiseau, France
| | - Antigoni Alexandrou
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS (Centre National pour la Recherche Scientifique) UMR (Unité Mixte de Recherche) 7645, Inserm (Institut national de la santé et de la recherche médicale) U696, Palaiseau, France
| | - Cedric Bouzigues
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS (Centre National pour la Recherche Scientifique) UMR (Unité Mixte de Recherche) 7645, Inserm (Institut national de la santé et de la recherche médicale) U696, Palaiseau, France
- * E-mail:
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Bouzigues C, Alexandrou A. [Map the intracellular concentration of reactive oxygen species]. Med Sci (Paris) 2014; 30:848-50. [PMID: 25311018 DOI: 10.1051/medsci/20143010010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Cédric Bouzigues
- Laboratoire optique et biosciences, CNRS UMR7645, Inserm U696, École polytechnique, route de Saclay, 91128 Palaiseau, France
| | - Antigoni Alexandrou
- Laboratoire optique et biosciences, CNRS UMR7645, Inserm U696, École polytechnique, route de Saclay, 91128 Palaiseau, France
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Nguyên TL, Castaing M, Gacoin T, Boilot JP, Balembois F, Georges P, Alexandrou A. Single YVO4:Eu nanoparticle emission spectra using direct Eu3+ ion excitation with a sum-frequency 465-nm solid-state laser. Opt Express 2014; 22:20542-20550. [PMID: 25321259 DOI: 10.1364/oe.22.020542] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report emission spectrum measurements on single YxEu(1-x)VO4 nanoparticles. The inhomogeneous widths of the emission peaks are identical for single nanoparticles and for ensembles of nanoparticles, while being broader than those of the bulk material. This indicates that individual nanoparticles are identical in terms of the distribution of different local Eu3+ sites due to crystalline defects and confirms their usability as identical, single-particle oxidant biosensors. Moreover, we report a 465 nm solid-state laser based on sum-frequency mixing that provides a compact, efficient solution for direct Eu3+ excitation of these nanoparticles. Both these two aspects should broaden the scope of Eu-doped nanoparticle applications.
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Alexandrou A, Dimitriou N, Levidou G, Griniatsos J, Sougioultzis S, Korkolopoulou P, Felekouras E, Pikoulis E, Diamantis T, Tsigris C, Tzivras M. The incidence of HPV infection in anal cancer patients in Greece. Acta Gastroenterol Belg 2014; 77:213-216. [PMID: 25090818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
BACKGROUND AND AIM OF THE STUDY Although anal cancer represents a relatively uncommon malignancy, its incidence over the last five decades, has been reported as increased for both sexes, worldwide. Human papillomavirus (HPV) infection has been shown to be a major cause for its development. The aim of the present study is to report on clinical, epidemiological and virological data of squamous anal cancer in Greek patients. PATIENTS AND METHOD Between January 2002 and December 2010, 11 Greek patients (6 females) who were diagnosed as suffering from squamous cell anal or perianal cancer, were treated in our Hospital. Formalin fixed paraffin embedded tissue samples, obtained at the time of the anal biopsy or surgery, were analyzed by PCR in order to identify the presence as well as the type of HPV infection. RESULTS Overall, the presence of HPV DNA was detected in 6 out of the 11 patients (54.5%). The "high risk" HPV DNA was detected in 3 of them (2 women and 1 man), while the "low risk" HPV DNA was detected in the remaining three (2 women and 1 man). CONCLUSION The incidence of HPV infection in squamous cell anal cancer Greek patients, is lower than other Western countries, probably reflecting differences in sexual habits in the Greek population.
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Basehore MJ, Michaelson-Cohen R, Levy-Lahad E, Sismani C, Bird LM, Friez MJ, Walsh T, Abidi F, Holloway L, Skinner C, McGee S, Alexandrou A, Syrrou M, Patsalis PC, Raymond G, Wang T, Schwartz CE, King MC, Stevenson RE. Alpha-thalassemia intellectual disability: variable phenotypic expression among males with a recurrent nonsense mutation - c.109C>T (p.R37X). Clin Genet 2014; 87:461-6. [PMID: 24805811 DOI: 10.1111/cge.12420] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 05/02/2014] [Accepted: 05/05/2014] [Indexed: 11/30/2022]
Abstract
Alpha-thalassemia intellectual disability, one of the recognizable X-linked disability syndromes, is characterized by short stature, microcephaly, distinctive facies, hypotonic appearance, cardiac and genital anomalies, and marked skewing of X-inactivation in female carriers. With the advent of next generation sequencing, mutations have been identified that result in less severe phenotypes lacking one or more of these phenotypic manifestations. Here we report five unrelated kindreds in which a c.109C>T (p.R37X) mutation segregates with a variable but overall milder phenotype. The distinctive facial appearance of alpha-thalassemia intellectual disability was present in only one of the 18 affected males evaluated beyond the age of puberty, although suggestive facial appearance was present in several during infancy or early childhood. Although the responsible genetic alteration is a nonsense mutation in exon 2 of ATRX, the phenotype appears to be partially rescued by the production of alternative transcripts and/or other molecular mechanisms.
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Affiliation(s)
- M J Basehore
- Greenwood Genetic Center, Molecular Diagnostic, Greenwood, SC, USA
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Bouzigues C, Nguyên TL, Ramodiharilafy R, Claeson A, Tharaux PL, Alexandrou A. Regulation of the ROS Response Dynamics and Organization to PDGF Motile Stimuli Revealed by Single Nanoparticle Imaging. ACTA ACUST UNITED AC 2014; 21:647-56. [DOI: 10.1016/j.chembiol.2014.02.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 02/20/2014] [Accepted: 02/21/2014] [Indexed: 02/07/2023]
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Türkcan S, Richly MU, Bouzigues CI, Allain JM, Alexandrou A. Receptor displacement in the cell membrane by hydrodynamic force amplification through nanoparticles. Biophys J 2014; 105:116-26. [PMID: 23823230 DOI: 10.1016/j.bpj.2013.05.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 05/07/2013] [Accepted: 05/20/2013] [Indexed: 12/11/2022] Open
Abstract
We introduce an intrinsically multiplexed and easy to implement method to apply an external force to a biomolecule and thus probe its interaction with a second biomolecule or, more generally, its environment (for example, the cell membrane). We take advantage of the hydrodynamic interaction with a controlled fluid flow within a microfluidic channel to apply a force. By labeling the biomolecule with a nanoparticle that acts as a kite and increases the hydrodynamic interaction with the fluid, the drag induced by convection becomes important. We use this approach to track the motion of single membrane receptors, the Clostridium perfringens ε-toxin (CPεT) receptors that are confined in lipid raft platforms, and probe their interaction with the environment. Under external force, we observe displacements over distances up to 10 times the confining domain diameter due to elastic deformation of a barrier and return to the initial position after the flow is stopped. Receptors can also jump over such barriers. Analysis of the receptor motion characteristics before, during, and after a force is applied via the flow indicates that the receptors are displaced together with their confining raft platform. Experiments before and after incubation with latrunculin B reveal that the barriers are part of the actin cytoskeleton and have an average spring constant of 2.5 ± 0.6 pN/μm before vs. 0.6 ± 0.2 pN/μm after partial actin depolymerization. Our data, in combination with our previous work demonstrating that the ε-toxin receptor confinement is not influenced by the cytoskeleton, imply that it is the raft platform and its constituents rather than the receptor itself that encounters and deforms the barriers formed by the actin cytoskeleton.
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Affiliation(s)
- Silvan Türkcan
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale U696, Palaiseau Cedex, France
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Richly MU, Türkcan S, Bouzigues C, Popoff MR, Masson JB, Allain JM, Alexandrou A. Investigating the Cell Membrane via Single Particle Tracking, Bayesian Inference and Hydrodynamic Force Application. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.3504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Richly MU, Türkcan S, Le Gall A, Fiszman N, Masson JB, Westbrook N, Perronet K, Alexandrou A. Calibrating optical tweezers with Bayesian inference. Opt Express 2013; 21:31578-31590. [PMID: 24514731 DOI: 10.1364/oe.21.031578] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present a new method for calibrating an optical-tweezer setup that does not depend on input parameters and is less affected by systematic errors like drift of the setup. It is based on an inference approach that uses Bayesian probability to infer the diffusion coefficient and the potential felt by a bead trapped in an optical or magnetic trap. It exploits a much larger amount of the information stored in the recorded bead trajectory than standard calibration approaches. We demonstrate that this method outperforms the equipartition method and the power-spectrum method in input information required (bead radius and trajectory length) and in output accuracy.
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Sismani C, Donoghue J, Alexandrou A, Karkaletsi M, Christopoulou S, Konstantinidou AE, Livanos P, Patsalis PC, Velissariou V. A prenatally ascertained, maternally inherited 14.8 Mb duplication of chromosomal bands Xq13.2-q21.31 associated with multiple congenital abnormalities in a male fetus. Gene 2013; 530:138-42. [PMID: 23973723 DOI: 10.1016/j.gene.2013.08.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 08/06/2013] [Accepted: 08/08/2013] [Indexed: 11/29/2022]
Abstract
Duplications of the X chromosome are rare cytogenetic findings, and have been associated with an abnormal phenotype in the male offspring of apparently normal or near normal female carriers. We report on the prenatal diagnosis of a duplication on the long arm of chromosome X from chromosomal band Xq13.2 to q21.31 in a male fetus with increased nuchal translucency in the first trimester and polyhydramnios at 22 weeks of gestation. Amniocentesis was undertaken and cytogenetic analysis revealed additional chromosomal material in the long arm of chromosome X at position Xq13. Analysis with high resolution array CGH revealed the additional material is in fact a duplication of the region Xq13.2-q21.13. The duplication is 14.8 Mb in size and includes fourteen genes: SLC16A2, KIAA2022, ABCB7, ZDHHC15, ATRX, MAGT1, ATP7A, PGK1, TBX22, BRWD3, POU3F4, ZNF711, POF1B and CHM. Analysis of the parents revealed the mother to be a carrier of the same duplication. After elected termination of the pregnancy at 28 weeks a detailed autopsy of the fetus allowed for genotype-phenotype correlations.
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Affiliation(s)
- C Sismani
- Department of Cytogenetics and Genomics, The Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus
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Labos G, Trakakis E, Pliatsika P, Augoulea A, Vaggopoulos V, Basios G, Simeonidis G, Creatsa M, Alexandrou A, Iliodromiti Z, Kassanos D, Lambrinoudaki I. Efficacy and safety of DT56a compared to hormone therapy in Greek post-menopausal women. J Endocrinol Invest 2013; 36:521-6. [PMID: 23563111 DOI: 10.3275/8926] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND Hormone therapy (HT) is the treatment of choice for the alleviation of menopausal symptoms; concerns, however, about its concomitant long-term health risks have limited its use. DT56a is a unique enzymatic isolate of soybeans. The purpose of our study was to evaluate the efficacy and safety of DT56a, compared to HT, in symptomatic post-menopausal women. SUBJECTS AND METHODS Eighty-nine post-menopausal women were studied prospectively. Women with climacteric symptoms were randomly assigned to receive eitherDT56a (no.=27) or oral low dose continuous combined HT (no.=26). Symptomatic women not wishing to receive any treatment served as controls (no.=36). Menopausal symptoms as assessed through the Kupperman index, serum lipids and lipoproteins, calcium, as well as bone mineral density (BMD), endometrial thickness, and mammography were assessed at baseline and at 12 months. RESULTS Patients receiving HT and DT56a showed a significant and independent decrease in menopausal symptoms (mean difference in Kupperman score, DT56a group: -3.98, HT group -5.601, no treatment group +1.76, p-value <0.001). Lumbar spine BMD T-score was significantly lower in women receiving no treatment, as opposed to the two treatment arms which showed no significant change (No treatment, baseline: -0.60, final: -0.85, p=0.001; HT, baseline: -84, final -0.99, p=0.79; DT56a, baseline -0.51, final: -0.76, p=0.75). No differences in femoral bone density, ET or mammography classification were detected in any of the treatment arms. Likewise, serum lipids or lipoproteins did not differ between the three groups. CONCLUSIONS DT56a decreased menopausal symptoms significantly and in the same degree as HT.
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Affiliation(s)
- G Labos
- 3rd Department of Obstetrics and Gynecology, University of Athens, Attikon Hospital, Athens, Greece
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Alexandrou A, Felekouras E, Giannopoulos A, Tsigris C, Diamantis T. What is the actual fate of super-morbid-obese patients who undergo laparoscopic sleeve gastrectomy as the first step of a two-stage weight-reduction operative strategy? Obes Surg 2013; 22:1623-8. [PMID: 22833137 DOI: 10.1007/s11695-012-0718-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The overall success-rate of the two-stage treatment plan for the treatment of super-morbid obesity has not yet been assessed. We reviewed the long-term results of 41 treated super-morbid-obese patients. Mean initial BMI was 59.5 ± 3.5 kg/m(2). Twelve patients (29.3 %) achieved after only LSG a BMI <35 kg/m(2) (mean 31.9 ± 2). They have lost 78.7 ± 11.8 % of excess body weight (EBW). The remaining 28 patients lost 48.1 ± 11.9 % of EBW and achieved a mean BMI of 44.2 ± 4.3 kg/m(2), thus requiring the second stage. Ten of them (24.4 % of the total or 35.7 % of those in need), were submitted to laparoscopic Roux-en-Y gastric bypass (LRYGBP). They lost 71.9 ± 4.3 % of EBW and have a mean BMI of 33.6 ± 2.7 kg/m(2). The 18 remaining patients have a BMI of 42 ± 3.6 kg/m(2) and they still suffer from morbid obesity. They have lost 48.5 ± 8.7 % of EBW. The mean rate of EBW loss for all the available 39 patients after either LSG or both LSG and LRYGBP has been 63.2 ± 16.5 % after a mean follow-up of 42.8 ± 19.5 months. Out of 41 patients, 1 died, 1 was lost to follow-up, 21 (51.2 %) achieved "healthy" BMIs and 18 (44 %) still require LRYGBP. The rate of cure of morbid obesity was 51.2 %. A remaining 44 % of super-morbid obese patients still need the completion LRYGBP but have not undergone it. Half of these patients have lost >50 % of their EBW. The two-stage strategy is an effective treatment plan for super-morbid obesity. A less patient-dependent strategy may be needed for a subset of patients.
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Affiliation(s)
- A Alexandrou
- Laiko Athens General Hospital, 1st Department of Surgery of the University of Athens, 17 Agiou Thoma St, 11527, Athens, Greece.
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Türkcan S, Richly MU, Alexandrou A, Masson JB. Probing membrane protein interactions with their lipid raft environment using single-molecule tracking and Bayesian inference analysis. PLoS One 2013; 8:e53073. [PMID: 23301023 PMCID: PMC3536804 DOI: 10.1371/journal.pone.0053073] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 11/22/2012] [Indexed: 11/18/2022] Open
Abstract
The statistical properties of membrane protein random walks reveal information on the interactions between the proteins and their environments. These interactions can be included in an overdamped Langevin equation framework where they are injected in either or both the friction field and the potential field. Using a Bayesian inference scheme, both the friction and potential fields acting on the ε-toxin receptor in its lipid raft have been measured. Two types of events were used to probe these interactions. First, active events, the removal of cholesterol and sphingolipid molecules, were used to measure the time evolution of confining potentials and diffusion fields. Second, passive rare events, de-confinement of the receptors from one raft and transition to an adjacent one, were used to measure hopping energies. Lipid interactions with the ε-toxin receptor are found to be an essential source of confinement. ε-toxin receptor confinement is due to both the friction and potential field induced by cholesterol and sphingolipids. Finally, the statistics of hopping energies reveal sub-structures of potentials in the rafts, characterized by small hopping energies, and the difference of solubilization energy between the inner and outer raft area, characterized by higher hopping energies.
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Affiliation(s)
- Silvan Türkcan
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, INSERM U696, Palaiseau, France
- Institut Pasteur, Physics of Biological Systems, Paris, France
- CNRS, URA 2171, Paris, France
| | - Maximilian U. Richly
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, INSERM U696, Palaiseau, France
| | - Antigoni Alexandrou
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, INSERM U696, Palaiseau, France
| | - Jean-Baptiste Masson
- Institut Pasteur, Physics of Biological Systems, Paris, France
- CNRS, URA 2171, Paris, France
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Griniatsos J, Yiannakopoulou E, Alexandrou A. A simple technique for vacuum drainage of the peritoneal cavity for the management of anastomotic leaks in patients with gastrointestinal malignancies. J BUON 2013; 18:292-294. [PMID: 23613421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
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Lambrinoudaki I, Papadimitriou D, Kaparos G, Rizos D, Panoulis C, Deligeoroglou E, Alexandrou A, Auguolea A, Apostolakis M, Creatsa M, Kouskouni E. MTHFR C677T polymorphism modifies the effect of HRT on metabolic parameters in postmenopausal women. Climacteric 2012; 16:568-75. [PMID: 23145891 DOI: 10.3109/13697137.2012.738722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To assess the interaction of the MTHFR C677T polymorphism with changes in lipid and glucose metabolism effected by oral hormone replacement therapy (HRT) in postmenopausal women. METHODS In this open-label, prospective, interventional study, parameters of lipid and glucose metabolism, as well as homocysteine, were assessed in 97 postmenopausal women at baseline and 1 year after the initiation of HRT. Participants were stratified into three subgroups, according to the MTHFR C677T polymorphism (wild-type: CC genotype; heterozygous: CT genotype; homozygous for the mutant variable: TT genotype). RESULTS The TT genotype was associated with an elevation of total and low density lipoprotein (LDL) cholesterol, while CT and CC genotypes were associated with a reduction of total cholesterol and LDL cholesterol after 1 year of HRT (p = 0.032 for total cholesterol and p = 0.002 for LDL cholesterol). Women with the TT genotype had higher glucose levels in contrast to women with the CC genotype who had lower glucose levels after 1 year of HRT (p = 0.011). Additionally, CC carriers under HRT had a significant elevation of apolipoprotein A1 levels (p = 0.018), contrarily to CT and TT genotypes. CONCLUSION While HRT was associated with favorable changes in lipid and metabolic parameters in carriers of the CC genotype, this effect was not evident in carriers of the T allele. The MTHFR C677T polymorphism may modify the effect of HRT on lipid and metabolic parameters in postmenopausal women.
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Affiliation(s)
- I Lambrinoudaki
- 2nd Department of Obstetrics and Gynecology, University of Athens , Aretaieio Hospital, Athens
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Lambrinoudaki I, Karaflou M, Kaparos G, Alexandrou A, Creatsa M, Aravantinos L, Augoulea A, Kouskouni E. Effect of tibolone and raloxifene on serum markers of apoptosis in postmenopausal women. Climacteric 2012; 16:258-64. [DOI: 10.3109/13697137.2012.668251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Türkcan S, Alexandrou A, Masson JB. A Bayesian inference scheme to extract diffusivity and potential fields from confined single-molecule trajectories. Biophys J 2012; 102:2288-98. [PMID: 22677382 DOI: 10.1016/j.bpj.2012.01.063] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Revised: 11/16/2011] [Accepted: 01/03/2012] [Indexed: 11/19/2022] Open
Abstract
Currently used techniques for the analysis of single-molecule trajectories only exploit a small part of the available information stored in the data. Here, we apply a Bayesian inference scheme to trajectories of confined receptors that are targeted by pore-forming toxins to extract the two-dimensional confining potential that restricts the motion of the receptor. The receptor motion is modeled by the overdamped Langevin equation of motion. The method uses most of the information stored in the trajectory and converges quickly onto inferred values, while providing the uncertainty on the determined values. The inference is performed on the polynomial development of the potential and on the diffusivities that have been discretized on a mesh. Numerical simulations are used to test the scheme and quantify the convergence toward the input values for forces, potential, and diffusivity. Furthermore, we show that the technique outperforms the classical mean-square-displacement technique when forces act on confined molecules because the typical mean-square-displacement analysis does not account for them. We also show that the inferred potential better represents input potentials than the potential extracted from the position distribution based on Boltzmann statistics that assumes statistical equilibrium.
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Affiliation(s)
- Silvan Türkcan
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale U696, Palaiseau, France
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Türkcan S, Masson JB, Casanova D, Mialon G, Gacoin T, Boilot JP, Popoff MR, Alexandrou A. Observing the confinement potential of bacterial pore-forming toxin receptors inside rafts with nonblinking Eu(3+)-doped oxide nanoparticles. Biophys J 2012; 102:2299-308. [PMID: 22677383 DOI: 10.1016/j.bpj.2012.03.072] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Revised: 03/20/2012] [Accepted: 03/23/2012] [Indexed: 12/26/2022] Open
Abstract
We track single toxin receptors on the apical cell membrane of MDCK cells with Eu-doped oxide nanoparticles coupled to two toxins of the pore-forming toxin family: α-toxin of Clostridium septicum and ε-toxin of Clostridium perfringens. These nonblinking and photostable labels do not perturb the motion of the toxin receptors and yield long uninterrupted trajectories with mean localization precision of 30 nm for acquisition times of 51.3 ms. We were thus able to study the toxin-cell interaction at the single-molecule level. Toxins bind to receptors that are confined within zones of mean area 0.40 ± 0.05 μm(2). Assuming that the receptors move according to the Langevin equation of motion and using Bayesian inference, we determined mean diffusion coefficients of 0.16 ± 0.01 μm(2)/s for both toxin receptors. Moreover, application of this approach revealed a force field within the domain generated by a springlike confining potential. Both toxin receptors were found to experience forces characterized by a mean spring constant of 0.30 ± 0.03 pN/μm at 37°C. Furthermore, both toxin receptors showed similar distributions of diffusion coefficient, domain area, and spring constant. Control experiments before and after incubation with cholesterol oxidase and sphingomyelinase show that these two enzymes disrupt the confinement domains and lead to quasi-free motion of the toxin receptors. Our control data showing cholesterol and sphingomyelin dependence as well as independence of actin depolymerization and microtubule disruption lead us to attribute the confinement of both receptors to lipid rafts. These toxins require oligomerization to develop their toxic activity. The confined nature of the toxin receptors leads to a local enhancement of the toxin monomer concentration and may thus explain the virulence of this toxin family.
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Affiliation(s)
- Silvan Türkcan
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale U696, Palaiseau, France.
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Augoulea A, Alexandrou A, Creatsa M, Vrachnis N, Lambrinoudaki I. Pathogenesis of endometriosis: the role of genetics, inflammation and oxidative stress. Arch Gynecol Obstet 2012; 286:99-103. [PMID: 22546953 DOI: 10.1007/s00404-012-2357-8] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Accepted: 04/19/2012] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Endometriosis is defined as the presence of endometrial tissue outside the uterine cavity. MATERIALS AND METHODS The etiology of this multifactorial disease is still unresolved and an increasing number of studies suggest that genetic, hormonal, environmental, immunological and oxidative factors may all play an important role in the pathogenesis of this disorder. CONCLUSIONS In this literature review, inflammatory activity, oxidative stress as well as genetic abnormalities and mutations have been studied in an effort to identify factors predisposing to endometriosis.
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Affiliation(s)
- A Augoulea
- 2nd Department of Obstetrics and Gynecology, University of Athens, Athens, Greece.
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Lambrinoudaki I, Augoulea A, Armeni E, Rizos D, Alexandrou A, Creatsa M, Kazani M, Georgiopoulos G, Apostolakis M, Panoulis K, Stamatelopoulos K. 30 CLIMACTERIC SYMPTOMS AND SUBCLINICAL ATHEROSCLEROSIS IN POSTMENOPAUSAL WOMEN. Maturitas 2012. [DOI: 10.1016/s0378-5122(12)70141-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Armeni E, Stamatelopoulos K, Georgiopoulos G, Kazani M, Kouskouni E, Creatsa M, Alexandrou A, Papamichael C, Lambrinoudaki I. 27 PREDICTORS OF SUBCLINICAL ATHEROSCLEROSIS IN POSTMENOPAUSAL WOMEN. Maturitas 2012. [DOI: 10.1016/s0378-5122(12)70138-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Armeni E, Stamatelopoulos K, Creatsa M, Rizos D, Georgiopoulos G, Kazani M, Alexandrou A, Papamichael C, Lambrinoudaki I. 10 SUBCLINICAL ATHEROSCLEROSIS AND ARTERIAL STIFFNESS ASSOCIATE WITH CIRCULATING ANDROGEN LEVELS IN HEALTHY RECENTLY MENOPAUSAL WOMEN. Maturitas 2012. [DOI: 10.1016/s0378-5122(12)70084-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Armeni E, Giannouli P, Zervas I, Koundi K, Spyropoulou A, Alexandrou A, Kazani A, Augoulea A, Creatsa M, Lambrinoudaki I. 123 PREDICTORS OF QUALITY OF LIFE IN GREEK MIDDLE-AGE WOMEN: A POPULATION SURVEY. Maturitas 2012. [DOI: 10.1016/s0378-5122(12)70234-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Armeni E, Stamatelopoulos K, Rizos D, Georgiopoulos G, Kazani M, Alexandrou A, Deligeoroglou E, Creatsa M, Bouboulis G, Alevizaki M, Lambrinoudaki I. 29 ARTERIAL STIFFNESS IS ASSOCIATED WITH HIGH NORMAL TSH IN HEALTHY POSTMENOPAUSAL WOMEN. Maturitas 2012. [DOI: 10.1016/s0378-5122(12)70140-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Griniatsos J, Yiannakopoulou E, Gakiopoulou H, Alexandrou A, Dimitriou N, Karavokyros I, Felekouras E. Clinical implications of the histologically and immunohistochemically detected solitary lymph node metastases in gastric cancer. Scand J Surg 2011; 100:174-80. [PMID: 22108745 DOI: 10.1177/145749691110000307] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Topographic correlation between the primary gastric tumor and the first peri- and extragastric lymphatic drain basin (solitary lymph node metastasis) on gastrectomy specimens, represents a reliable method to investigate and understand the exact pattern of lymphatic drainage from a gastric tumor. Analyzing that correlation, useful information regarding the extent of the appropriate oncological perigastric lymphadenectomy will be provided. We retrospectively evaluate the usefulness of a modified D2 lymphadenectomy in gastric cancer patients, based on the topographic correlation between the primary tumor and the location of the solitary lymph node metastases, as they were detected by histology and immunohistochemistry. MATERIALS AND METHOD Between April 2003 and March 2010, 134 gastric cancer patients were submitted to a modified D2 lymphadenectomy. Postoperatively, the standard histological ex-amination by hematoxylin and eosin (HE) staining, disclosed metastatic infiltration of at least two lymph nodes in 90 patients, solitary lymph node metastases were histologically detected in 10 patients, while the remaining 34 patients were classified as pN0. All lymph nodes of the ten patients with histological solitary lymph node metastases, as well as the 34 patients who had been classified as pN0 by histology, were further submitted to immunohistochemistry for micrometastases detection. More than one micrometastases were detected in none of them, while in seven patients solitary micrometastases were detected either in the level I perigastric or in the level II extragastric lymph nodes stations (skip micrometastases). RESULTS Solitary lymph node metastases were detected by histology in ten patients and by immunohistochemistry in additional seven (nine females and eight males). Solitary metastases were detected in the level I LN stations in seven patients (four by histology and three by immunohistochemistry) and in the level II LN stations in ten patients (six by histology and four by immunohistochemistry). In order of frequency, the solitary lymph node metastases were located in the no 7 (n = 6), no 6 (n = 4), no 9 (n = 2), no 5 (n = 2), no 4 (n = 1), no 8 (n = 1) and no 12 (n = 1) LN stations. Skip metastases encountered the 60% of the histologically detected, 57% of the immunohistochemically detected and 59% of all solitary lymph node metastases. 80% of solitary metastases in the level II LN stations, were mainly located in the nos 7-9 lymph node stations complex. Tumors of the lower and middle-third of the stomach were equally drained both to the level I and level II lymph node stations, while 67% of the tumors towards the lesser curvature, were mainly drained in the level II lymph node stations. CONCLUSION D2 lymphadenectomy increases the number of true R0 resections. Thus, a modified D2 lymphadenectomy should be routinely performed in gastric cancer patients.
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Affiliation(s)
- J Griniatsos
- First Department of Surgery and Pathology Department, University of Athens, Medical School, Laiko Hospital, Athens, Greece.
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Lambrinoudaki I, Augoulea A, Armeni E, Rizos D, Alexandrou A, Creatsa M, Kazani M, Georgiopoulos G, Livada A, Exarchakou A, Stamatelopoulos K. Menopausal symptoms are associated with subclinical atherosclerosis in healthy recently postmenopausal women. Climacteric 2011; 15:350-7. [DOI: 10.3109/13697137.2011.618564] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Abstract
Biomedicine and cell and molecular biology require powerful imaging techniques of the single molecule scale to the whole organism, either for fundamental science or diagnosis. These applications are however often limited by the optical properties of the available probes. Moreover, in cell biology, the measurement of the cell response with spatial and temporal resolution is a central instrumental problem. This has been one of the main motivations for the development of new probes and imaging techniques either for biomolecule labeling or detection of an intracellular signaling species. The weak photostability of genetically encoded probes or organic dyes has motivated the interest for different types of nanoparticles for imaging such as quantum dots, nanodiamonds, dye-doped silica particles, or metallic nanoparticles. One of the most active fields of research in the past decade has thus been the development of rare-earth based nanoparticles, whose optical properties and low cytotoxicity are promising for biological applications. Attractive properties of rare-earth based nanoparticles include high photostability, absence of blinking, extremely narrow emission lines, large Stokes shifts, long lifetimes that can be exploited for retarded detection schemes, and facile functionalization strategies. The use of specific ions in their compositions can be moreover exploited for oxidant detection or for implementing potent contrast agents for magnetic resonance imaging. In this review, we present these different applications of rare-earth nanoparticles for biomolecule detection and imaging in vitro, in living cells or in small animals. We highlight how chemical composition tuning and surface functionalization lead to specific properties, which can be used for different imaging modalities. We discuss their performances for imaging in comparison with other probes and to what extent they could constitute a central tool in the future of molecular and cell biology.
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Affiliation(s)
- Cedric Bouzigues
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS UMR7645 INSERM U696, 91128 Palaiseau Cedex, France.
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Abstract
This paper presents a method to control the motion of nanolitre drops in a wide and thin microchannel, by etching fine patterns into the channel's top surface. Such control is possible for drops that are squeezed by the channel roof, by allowing them to reduce their surface energy as they enter into a local depression. The resulting gain in surface energy pulls a drop into the groove such that localized holes can be used as anchors for holding drops, while linear patterns can be used as rails to guide them along complex trajectories. An anchored drop can remain stationary indefinitely, as long as the driving flow rate is below a critical value which depends on the hole and drop sizes. By micro-fabricating holes into a grid pattern, drops can be arrayed and held in the observation field of a microscope against the mean carrier flow. Their contents can then be modulated by gas exchange with the flowing carrier oil. We demonstrate in particular how the pH or the oxygen levels within the drops can be controlled spatially and temporally, either by exposing rows of drops to two streams of oil at different gas concentrations or by periodically switching oil inputs to vary the gas concentration of drops as a function of time. Oxygen control is used to selectively deoxygenate droplets that encapsulate red blood cells from patients suffering from sickle cell disease, in order to study the polymerization of intracellular hemoglobin. Cycles of oxygenation and deoxygenation of anchored droplets induce depolymerization and polymerization of the hemoglobin, thus providing a method to simulate the cycling that takes place in physiological flows.
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Affiliation(s)
- Paul Abbyad
- Laboratoire d'Hydrodynamique (LadHyX) and Department of Mechanics, Ecole Polytechnique, CNRS, 91128 Palaiseau, France
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Abbyad P, Dangla R, Tharaux PL, Baroud C, Alexandrou A. Red Blood Cell Sickling in Microdroplet Arrays. Biophys J 2011. [DOI: 10.1016/j.bpj.2010.12.2764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Masson JB, Türkcan S, Renner M, Dahan M, Alexandrou A. Measuring Hopping Energies of Individual Biomolecules. Biophys J 2011. [DOI: 10.1016/j.bpj.2010.12.1054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Lambrinoudaki I, Kaparos G, Armeni E, Alexandrou A, Damaskos C, Logothetis E, Creatsa M, Antoniou A, Kouskouni E, Triantafyllou N. BsmI vitamin D receptor’s polymorphism and bone mineral density in men and premenopausal women on long-term antiepileptic therapy. Eur J Neurol 2010; 18:93-8. [DOI: 10.1111/j.1468-1331.2010.03103.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Lambrinoudaki I, Karaflou M, Kaparos G, Grigoriou O, Alexandrou A, Panoulis C, Logothetis E, Creatsa M, Christodoulakos G, Kouskouni E. The effect of hormone therapy and tibolone on serum CD40L and ADAM-8 in healthy post-menopausal women. J Endocrinol Invest 2010; 33:720-4. [PMID: 20436265 DOI: 10.1007/bf03346677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND/AIM The role of neutrophils and platelets in atherothrombotic disease is well established. The aim of our study was to investigate the effect of HT and tibolone on the soluble markers of neutrophil and platelet activation, "a disentigrin and metalloproteinase domain" (ADAM-8) and CD40 ligand (CD40L) respectively, in healthy post-menopausal women. SUBJECTS AND METHODS One hundred and six healthy post-menopausal women were randomly allocated to: estradiol plus drospirenone (E₂/DSP), E₂ hemihydrate 1 mg plus norethisterone acetate (E₂/NETA) 0.5 mg, and tibolone 2.5 mg. Serum ADAM-8 and CD40L were measured at baseline and at 6 months. RESULTS Baseline values of ADAM-8 and CD40L were similar between groups. No significant correlation was revealed between ADAM-8 or CD40L and parameters related to cardiovascular risk factors in each group. No significant changes were observed between baseline values and values at 6 months (E₂/DSP group: ADAM-8: 267.4±71.3 pg/ml vs 270.7±42.8 pg/ml, p=0.86, CD40L: 6.43±3.13 vs 6.79±2.70 ng/ml, p=0.67), (E₂/NETA group: ADAM-8: 308.3±64.3 vs 294.7±57.7 pg/ml, p=0.40, CD40L: 9.68±2.81 vs 8.59±5.13 ng/ml, p=0.51), (tibolone group: ADAM-8: 307.5±87.5 vs 289±48.1 pg/ml, p=0.48, CD40L: 9.46±4.30 vs 9.26±4.60 ng/ml, p=0.99). CONCLUSIONS Our study has not revealed an association between estrogen plus progestin treatment or tibolone on serum ADAM-8 and CD40L levels in healthy post-menopausal women. Larger prospective studies are needed to further investigate the effect of low-dose HT or tibolone on serum markers of neutrophil and platelet activation.
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Affiliation(s)
- I Lambrinoudaki
- 2nd Department of Obstetrics and Gynecology, University of Athens, Aretaieion Hospital, Athens, Greece
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Abbyad P, Tharaux PL, Martin JL, Baroud CN, Alexandrou A. Sickling of red blood cells through rapid oxygen exchange in microfluidic drops. Lab Chip 2010; 10:2505-12. [PMID: 20603684 DOI: 10.1039/c004390g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We have developed a microfluidic approach to study the sickling of red blood cells associated with sickle cell anemia by rapidly varying the oxygen partial pressure within flowing microdroplets. By using the perfluorinated carrier oil as a sink or source of oxygen, the oxygen level within the water droplets quickly equilibrates through exchange with the surrounding oil. This provides control over the oxygen partial pressure within an aqueous drop ranging from 1 kPa to ambient partial pressure, i.e. 21 kPa. The dynamics of the oxygen exchange is characterized through fluorescence lifetime measurements of a ruthenium compound dissolved in the aqueous phase. The gas exchange is shown to occur primarily during and directly after droplet formation, in 0.1 to 0.5 s depending on the droplet diameter and speed. The controlled deoxygenation is used to trigger the polymerization of hemoglobin within sickle red blood cells, encapsulated in drops. This process is observed using polarization microscopy, which yields a robust criterion to detect polymerization based on transmitted light intensity through crossed polarizers.
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Affiliation(s)
- Paul Abbyad
- Laboratoire d'Optique et Biosciences (LOB), Ecole Polytechnique, INSERM U696, CNRS, 91128 Palaiseau, France
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Diamantis T, Alexandrou A, Pikoulis E, Diamantis D, Griniatsos J, Felekouras E, Papalambros E. Laparoscopic Sleeve Gastrectomy for Morbid Obesity with Intra-operative Endoscopic Guidance. Immediate Peri-operative and 1-year Results after 25 Patients. Obes Surg 2010; 20:1164-70. [DOI: 10.1007/s11695-010-0176-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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